A classical 3 by 2-cubed randomized block experiment in four blocks of size
24. The response is the total weight of sugarbeet roots off the plot, but
this is accompanied by the number of roots measured. The suggestion is
that number of roots should be a covariate to allow for varying plot size.
Value
The factors are Variety (3 levels, a, b and c), and N, P and K
each at 2 levels, present or absent.